Guard for power-presses



J. E. PHILLIPS, GUARD FOR POWER PRESSES. APPLICATION man APR. 14, 1920.

1,366,704. P e ted Jan. 25, 1921.

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I, E. PHILLIPS. GUARD FOR POWER FRESSES. APPLICATION FILED APR. 14, I920.

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I APPLICATION FILED APRI14, i920 1 ,366,704:. Patented Jan. 25; 1921.

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I, E. PHILLIPS.

GUARD FOR POWER PREssEs, APPLICATION FILED APR. 14, 1920.

1,366,704. Patented Jan. 25,1921.

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J. E. PHILLIPS. GUVARTD FOR POWER PRESSES. APPLI'cATI N men APR. .mi920.

1,366,704. Patelited Jan. 25,1921.

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GUARD FOR POWER PRESSES. APPLjCATlONflLED APR. :4. 192a.

Patented Jan. 25, 1921.

Mew/50r- JOHN EDWIN PHILLIPS, 01 BIRIILINGEAIII, ENGLAND.

GUARD FOR POWER-PBESSES.

Specification of Letters Patent.

Patented Jan. 25,1921.

Application filed .g rn 14', 1920. Serial No. 373,902,

To all whom it may concern:

Be it known that I, J OHN EDWIN FHIL- runs, a subject of the King of Great Britain, residing at Birmingham, l lngland, have 111- vented certain new and useful Improvements in Guards for Power-Presses, of which the following is a specification.

This invention relates to guards for power presses, said guards being of the kind comprising two lazy-tongs or like collapsible and extensible frames mounted upon vertical axis and operated by an actuating device, so that the frames can beextended into their operative or safety position prior to the upper tool or die carried by the plunger of the press descending into the work space.

The object of the present invention is to provide improved means for operating the uard. 6 The said invention consists essentially in positively withdrawing or collapsing the frames, by means of the plunger of the press, against the action of a spring, which latter acts to extend the guard frames into their operative position on the withdrawal means being disengaged or disconnected from the guard-actuating device.

Figure 1 of the accompanying drawings is a front elevation showing the guard extended in front ofthe press.

Fig. 2 is a similar view but shows the plunger raised and the guard collapsed.

Fig. '3 is a rear view of the guard when collapsed.

Fig. 1 represents a plan.

Fig. 5 is a plan showingthe angle of the guard frame adjusted and the actuating means similarly adjusted.

Fig. 6 represents a vertical sectional elevation, upon alarger scale, of the vertical axis upon which the guard frames are mounted.

Fig. 7 is a front elevation of a modification, the guard being collapsed.

Fig. 8 is a plan. j r V Fi 9 is a side view with the guard collapsdbl, and l 1 v Fig. 10 is a similar side view showing the plunger down and the guard extended.

Figs. 11 and 12 are side elevation and plan of another form.

Figs. 13 and 1 1 are side and front elevations of a further modification.

Referring to Figs. 1 to 6, the guard comprises two extensible and collapsible frames 1, 1, of lazy-tongs construction, of which the lower extremitiesof the inner end members are pivoted to lugs or brackets 2 carr ed by collars 3 fixed by nuts 7 upon a vertlcal axls 1 attached to the bed of the press. The upper extremities of the end members of the frame are pivoted to similar lugs or brackets 5 carried by collars 6 rotatably mounted upon a sleeve 8 which is feathered to slide upon the upper adjustable portion of the vertical axis, said sleeve 8 having a pin or projection 9 engaging a vertical groove 10 111 the axis (see Fig. 6). Fixed upon the sleeve 8 above the collars 6 is a forwardly extending arm or bracket 11 to which the upper end of a coiled tension spr ng 12 is connected, the lower end of the spring being anchored to the base of the vertical axis l. This spring acts so as normally to draw the sleeve downward, together with the collars 6 thereon, thus extending the guard frames 1, 1, into their operative positions, as in Fig. 1.

The frames are adapted to be collapsed,

when the plunger of the press rises, by T means which transmits the upward motion of the plunger to the sliding actuating sleeve of the guard. Thus, as shown, swivelly mounted upon the arm or head 11 of the slid ng sleeve 8 is a swivel pin or post 13 having a screwthreaded end 18 engaging a tapped hole in a projecting part it screwed into the arm 11, so as to turn in a horizontal plane, and pivoted to the part 13, so as to turn in a vertical plane, is a lever or. link 15 whose opposite end is jointed to the summit of an'inclined support or bracket 16 the lower end of which is swivelly or rotatably mounted within a bearing 17 carried by the foot of the vertical axis. Connected to the lever 15 intermediate its ends is the lower end of a vertical rod 19 whose upper end passes through and can slide within an aperture in an arm or link 20 adjustably connected by a pin and slot 21, 22 to a bracket 23 attached to the plunger of the press the rod 19 being provided, upon the upper face of the arm 20, with a stop or abutment 24, which may conveniently be in the form of a nut. When the plunger rises the bracket arm 20 engages the abutment 24. and raises the sliding sleeve 8 of the guard, so collapsing the lazy-tongs frames against the action of the sprin 12, which is extended, as shown in Fig. 2. is the plunger starts to descend, the spring12 is allowed to come into action and extends the guard frames, and the bracket arm 20 on the plunger moves idly over the connecting rod 19, as shown in Fig, 1; and likewise, as the plunger rises, the arm 20 slides upward over the rod until it meets the abutment 24;, when it causes the guard to collapse, as above described.

The angle at which the guard frames 1, 1, are set can be adjusted and re-set by slackening the two nuts 7 011a screw-threaded portion of the vertical axis 4, then turning the collars 3 about the latter, and re-tightening the nuts. When this adjustment is made the connecting'rod 19, with the lever 15 and inclined swiveling support or bracket 16, are swung angularly so that the lever 15 takes up a position approximately parallel to one 7 of the guard frames, a corresponding adjustment being made, by means of the pinand-slot connection 21, 22, between the plunger bracket 23 and the arm or link 20 carried thereby, as shown. in Fig. 5. swiveling support 16 is adapted to be fixed in its adjusted position by'a set-screw 25.

Referring to the modification illustrated in Figs. 7 to 10, the guard'comprises two extensible and collapsible lazy-tongs frames 1, 1, of which the lowerextremities of the inner end members are pivoted to lugs or brackets carried by collars 3 fixed upon a vertical axis 1.] The upper extremities of the end members of the frames are pivoted to similar lugs or brackets carried by colhas 6- fixed upon a vertical stem 26 sliding within a socket or guide sleeve 27 carried by the vertical axis 4' upon which the lower portions of the frames are mounted. This vertical stem 26 is provided, above the collars 6, with-a forwardly extendingarm or bracket llto which the upper end of a coiled tension spring '12 is connected, the lower end of the spring being anchored to the bed of the press; "This sprmg 12 acts so as non mally to draw the stein 26 downward, together with the collars 6 thereon, thus extending the guard frames intotheir opera tive positions, as in Fig. 10. The frames are collapsed, when the plunger of-the press rises, by means of a catch. device consisting of a depending spring blade 27 attached at its upper end to the plunger and carrying at itslower end a catch head 28 which engages beneathv the rear end of the arm 11' at the'topof the sliding stem, hus raising the latter together with the collars to which the up'p er portions of the. guard frames are connected, thereby collapsing the said frames, as in Fig. 9. When, however, the

, clutch lever 29 of the press is operated, a 5 wedge 30, carried by a sliding rod 31 operated by the said: lever, is forced between the sliding stem 26 and the front face of the spring blade 27, thereby forcing the catch out of engagement, whereupon the spring 12, which has been extended during the collapsing of the guard, acts to draw down the sliding stem 26 and thus extends the guard releasing the catch, a lever, cam or other su table device operated by the clutch leveror' pedal may be employed. Thus, in the case of a pedal-operated clutch, as in Figs. 11 and 12, the pedal has connected to it a vertical sliding link or rod 32 the upper end of which is guided by a pin 33 engaging a slot 34, and is shaped uponone edge in the form of a cam 35which engages one arm of a bell-crank lever 36, pivoted to the arm or head 11, so that when the link 32 is drawn down it operates the bell-crank lever so as to release the catch 27, 28.

' n1 the form shown'in Figs. 13 and'lt, a

rod 32 connected to the pedal operates a lever 37 pivoted to the head 11 and tur1 1ing in a vertical plane, so that the said lever engages the spring blade 27 and releases the two collapsible and extensible frames, an

actuating device operated by the" plunger of the press for collapsing the frames when the said plunger rises, a spring tending to. extend the frames, aird means for disconnect, ing the plunger from the. actuating device before said plunger reaches. the work space of the press; J I

2. A 'gu'ard for a power press-comprising two collapsible and extensible frames, an actuating device for collapsin the frames, lifting means carried by the plunger of the press forconnection with the actuating device in order to collapse the guard", a spring tending to extend the frames, and means whereby the lifting means are disconnected from the actuating devicebefore the plunger descendto the work space. j

3. A guard for a power press comprising two collapsible and extensible frames, an I actuating device for collapsing the frames,

means associated .with the plunger of the press and the actuating device adapted, on the upward movement of the plunger, to raise. the actuating device to collapse the actuating device on the downward movement of the plunger, and a; spring connected to the actuating device tending to extend the frames. I

frames but havingno infiuenceon the said by the plunger of the press and having an opening through which the upper end of the rod freely passes, an abutment upon the end of the rod above the bracket adapted to be 5 engaged by the bracket when the plunger rises and to be disengaged therefrom when the plunger descends, and a spring tending to extend the frames.

5. A guard for a power press comprising 10 two collapsible and extensible frames mounted and adjustable to difierent angular positions upon a common vertical axis, a sliding member mounted on said axis and connected to the frames, a lever member swivelly jointed to said sliding member, an angularly disposed support connected to the outer end of the lever member and swivelly mounted at its lower end, a rod connected to the lever member, a bracket carried by the plunger of the press and having an opening throu h which the upper end of the rod free y passes, an abutment upon the end of the rod above the bracket and a spring connected to the sliding device tending to extend the frames.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN EDWIN PHILLIPS. Witnesses N. L. SKERRETT, IV. L. SKERnn'r'r. 

